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Old 12-30-2008, 09:56 PM   #1
weston666
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Default subaru baja misfiring and backfiring under accelertation

2003 Subaru baja 100k miles on it.
The car will run perfect under hard acceleration untill I drive it for about 5 minutes, then when i give it more than Half throttle it will start to stutter, backfire and miss on Cylinder 3, I have tested the spark plug wires, looked at the spark plugs, installed new fuel filter, and put in a new throttle body with the 3 sensors, As to no avail. I was also thinking maybe it has a bad fuel injector, but that wouldnt explain why it runs perfect when its cold. Has anyone had these same problems? thanks.
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Old 12-30-2008, 11:14 PM   #2
weston666
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anyone?
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Old 12-31-2008, 12:29 AM   #3
Buck Rogers
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Plugs / gap ? And if the plugs are original, than definitely change them
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Old 12-31-2008, 12:34 AM   #4
Baja820
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ecu reflash........ one of my friends had the same prob with a 03 wrx took it to the dealership and presto prob solved. could be wrong though, im just guessing
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Old 12-31-2008, 12:58 AM   #5
weston666
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what could be wrong with the ecu????
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Old 12-31-2008, 04:37 AM   #6
BajaSleeper
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Are you running higher boost with a boost controller?
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Old 12-31-2008, 07:53 AM   #7
jeromes
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Exclamation Mass Air Flow Sensor

Could be the Mass Air Flow Sensor. I have a 98 Forester that had about the same symptoms before the MAF failed completely. It had about 150K miles on it.
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Old 12-31-2008, 09:47 AM   #8
holland_patrick
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Quote:
Originally Posted by BajaSleeper View Post
Are you running higher boost with a boost controller?
2003 baja ...

there was nol turbo option...

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Old 12-31-2008, 10:04 AM   #9
Baja820
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Dunno...... like i said, my friends 03 wrx started having the same issue one night took it to the dealership the next morning (they actually had to reflash the ecu twice) and it fixed the prob.....just a weird glitch or something.
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Old 12-31-2008, 12:58 PM   #10
moonzie
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You could try an ECU reset, but I suspect you've probably already done that with all of the work you've already done! Disconnect your battery for a few hours then reconnect.
But I doubt that would help - that really sounds like a sensor problem.

You mentioned a new throttle body with 3 sensors. Which sensors were replaced?
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Old 01-01-2009, 12:25 PM   #11
Hawk296
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I agree, change the plugs/wires if you haven't done that yet. Have you checked Camshaft/ crankshaft position sensors? They seem to go bad regularly.
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Old 01-01-2009, 07:57 PM   #12
moonzie
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Quote:
Originally Posted by Hawk296 View Post
Have you checked Camshaft/ crankshaft position sensors? They seem to go bad regularly.
Hawk - is that on both SOHC and DOHC motors?
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Old 01-01-2009, 08:34 PM   #13
Hawk296
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Quote:
Originally Posted by moonzie View Post
Hawk - is that on both SOHC and DOHC motors?
In my experience, I have had to replace both of those sensors on Non-turbo DOHC and SOHC engines.
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Old 01-11-2009, 01:29 AM   #14
Emsanon
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I've never run into an issue with it backfiring when I accelerate just when I coast downhill. My '03 pops, I guess it's afterlighting, when I coast because of a lack of back pressure to the engine which I still haven't fixed yet.
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Old 01-11-2009, 02:45 AM   #15
SoundgardenSuby
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plugs, wires, coilpack, get them replaced, reflash ecu, done.
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Old 01-12-2009, 10:36 AM   #16
onslot19
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hey the same problem happen to me three months ago. the spark wires looked ok but i decided to pull them out again and look closley and there was a small crack on the boot of cylinder 3 spark wire try the same you might be in good shape
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Old 01-12-2009, 05:53 PM   #17
dioncgy
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I am experiencing exactly the same symptoms. In the summer I had the 96000Km service(so new spark plugs and wires). Even before that, I noticed that quite randomly, but never when cold, I couldn't accelerate normally after stopping at a light. I could not predict though when it would happen. Last month it was worse and worse, the frequency of loosing power at lights or after reducing speed was higher, and finally it started to misfire and backfire when I insisted on pushing the gas pedal to get higher than 1000-1500 rot/min on tachometer. I cannot elaborate technically as I am not that qualified. I was able to start just fine at -25C. But after the engine got warmed, it started to stutter. It has periods of running perfectly at high speed e.g 110Km/h, and then stutter. At such high speed it seems to be better because it just recovers quickly, but at low speed, especially when idled, it is just like not all the cylinders work. It helps if I keep it on park at lights and push the gas from time to time when I fill it starting to stutter so that I get more than 2000 rot/min. I suspect some kind of a clot along the gas tract from the tank to the engine. But that might be of course over-simplistic. I also considered that the air/gas ratio not right, as I get a strong smell of unburned gasoline. I booked a service next week. I also need to replace the muffler, which I new I should for few months already.
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Old 01-15-2009, 02:14 PM   #18
BrunoShield
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My 03 NA/Auto Baja does the same thing as long as the temps are below 0C. Stumbles, won't idle properly, strong smell of unburned gas. I turn off the car, sometimes it dies completely and on restart it's fine. It acts like the injectors are on full bore and it's running on two cylinders. It only happens in cold weather, and only after it's been parked all night. If it was a '68 Dart I'd suspect the choke but fuelies don't have one. It's done that since I bought it almost two years ago. Whatever it is, a restart has cured it every time so far.
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Old 04-01-2009, 04:26 PM   #19
weston666
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Turns out the #3 spark plug wire was toast. Good call you guys
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